Improving cardiorespiratory fitness from low to above average is associated with a 60-70% reduction in all-cause mortality.

“if you go from low to below average to above average too high to elite you can see what is the hazard ratio so it's interesting going from just being low to being below average is a 50 reduction in mortality over a decade if you're starting in your 50s”

“the greatest longevity benefit that comes from improving your V2 Max is from people starting from a below average V2 Max and moving anywhere above average so even going from a below normal V2 Max for your age group and gender to a low normal is associated with a 2.1y year increase in life expectancy bumping that up going from a below below normal to high normal V 2 max is associated with a 2.9 year increase in life expectancy and going even further to the upper limit of normal is associated with 4.9 years so almost 5year increase in life expectancy on average”